/*******************************************************************************
 * Copyright 2017 Bstek
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package com.bstek.ureport.export;

import java.util.ArrayList;
import java.util.List;

import com.bstek.ureport.build.paging.Page;
import com.bstek.ureport.definition.Paper;
import com.bstek.ureport.model.Report;

/**
 * @author Jacky.gao
 * @since 2017年3月23日
 */
public class PageBuilder {
	
	public static FullPageData buildFullPageData(Report report) {
		List<Page> pages = report.getPages();
		int pageSize = pages.size();
		int totalPages = pageSize;
		Paper paper = report.getPaper();
		List<List<Page>> list = new ArrayList<List<Page>>();
		if (paper.isColumnEnabled()) {
			int columnCount = paper.getColumnCount();
			totalPages = totalPages / columnCount;
			int mode = totalPages % columnCount;
			if (mode > 0) {
				totalPages++;
			}
			for (int i = 0; i < pageSize; i++) {
				List<Page> columnPages = new ArrayList<Page>();
				int end = i + columnCount;
				for (int j = i; j < end && j < pageSize; j++) {
					columnPages.add(pages.get(j));
					i = j;
				}
				list.add(columnPages);
			}
		}
		return new FullPageData(totalPages, paper.getColumnMargin(), list);
	}

	public static SinglePageData buildSinglePageData(int pageIndex, Report report) {
		List<Page> pages = report.getPages();
		int pageSize = pages.size();
		int totalPages = pageSize;
		Paper paper = report.getPaper();
		List<Page> columnPages = new ArrayList<Page>();
		if (paper.isColumnEnabled()) {
			int columnCount = paper.getColumnCount();
			totalPages = pageSize / columnCount;
			int mode = pageSize % columnCount;
			if (mode > 0) {
				totalPages++;
			}
			int pageStart = (pageIndex - 1) * columnCount, pageEnd = pageStart + columnCount;
			if (pageStart + 1 > pageSize) {
				pageStart = pageSize - 1;
			}
			if (pageEnd <= pageStart) {
				pageEnd = pageStart + 1;
			}
			for (int i = pageStart; i < pageEnd; i++) {
				if (i >= pageSize) {
					break;
				}
				columnPages.add(pages.get(i));
			}
		} else {
			if (pageIndex > pageSize) {
				pageIndex = pageSize;
			}
			columnPages.add(pages.get(pageIndex - 1));
		}
		return new SinglePageData(totalPages, pageIndex, paper.getColumnMargin(), columnPages);
	}

	public static void main(String[] args) {
		int columnCount = 3;
		int totalPages = 30;
		int total = totalPages / columnCount;
		int mode = totalPages % columnCount;
		if (mode > 0) {
			total++;
		}
		System.out.println(total);
	}
}
